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Finding the Fourth Proportional to 20,455.60, 30,748.20 and 18,900.40

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Solution

The fourth proportional to 20,455.60, 30,748.20 and 18,900.40 is: 28,410.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,455.60 : 30,748.20 = 18,900.40 : x
  2. Step 2: Convert to fraction form
    20,455.60/30,748.20 = 18,900.40/x
  3. Step 3: Cross multiply
    20,455.60x = 30,748.20 × 18,900.40
  4. Step 4: Simplify right side
    20,455.60x = 581,153,279.28
  5. Step 5: Solve for x
    x = 581,153,279.28/20,455.60
  6. Step 6: Final answer
    x = 28,410.47

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.